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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb9a86e1a0d943eba9b8ddc8b4357a60c30499018404842d46871c8306076ad' 
  AND token = 'utUtGNBuw3nNF/+EQBcEV+HwhC7LeQMyOGKwvRt4kyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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