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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbea4a5c68dfd870bca387723b408805cb1ee4b0988722e98d0e533d214b0c3a' 
  AND token = '6edH2XbxycQBg5v/dZ+qF2UEUJrOp3m1TyDYg3GA+Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}