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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1477ca8622d7472196eda59d6f0c5b167e15c67de4e7603b5857088c46fb812' 
  AND token = '58IofL2+VmN5cSv/a6DPB1ePcCY6ADgspAvrfAExakw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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