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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a767efaa74383f33c5865a377bbc8d4820c1c3b73a1b9d677d3ac7a08bba9b09' 
  AND token = 'FFKngLdgzpCUAVips4wGnvdqzgu2CcPYjukLjgTTocA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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