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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0866a280b008b6ebdffce0137b9797dc5ba9084fd3b26c5476a410ff1884ec7' 
  AND token = 'eYSLFwHQF3aSk/rgsNv6OsaAk74+NVHolzagnh7rWJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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