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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ebef6bb35496523bb9ab0220b6b8a4f6f56d1aea2a0903517ebd1f8a8454b55' 
  AND token = 'oSyL5HVVeIVCE4xkKotHodWLkrqFBme2duyhsnMYtc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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