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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e2cb4068fdfd6426c64b537239ac878b6658bcce73ec054af0d325baf6d664' 
  AND token = 'mghh5HU8FNtAGTO4Y7vYR08sr7q77yRCUhuqIXULs1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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