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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b07b03e6695556edc103f61c36891f3d86918c1b271ef672efe8e3d9baba3cf3' 
  AND token = 'O7pze/XCfyQCQKvG18qo3A3mp31qsBmCQYvCLx4vczk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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