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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6076823aa772dd173681d0b93ef777b42f8f5819cabfe8eecd0b60a71e9e0544' 
  AND token = '63Rq59tRtSdkpspOVGhkSeSU8xUjwQ5VJYvx32lGMKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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