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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f3069a8dc6183fbe820c2b10215eca11b852714a3e1b193e65c8a994d9cd5b' 
  AND token = '1wEyUJLfJV4GxPU3m6tjpR3IG3kLs/c5guCfrQyAzLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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