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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32535926302568fbd7a209302a64d3dd43f1d62765da1fa1d4bdd2107e56096f' 
  AND token = 'VPhrUwcZ1U5zkj1nhnYkO8+xRHuk1cHFUZcyoOTWFWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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