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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58f5a0cd1cddf79ef679c2a1917cd842366c602d21ecdbca2320db62d22e53d0' 
  AND token = 'nU99HutCy5CGgXl3i4RNh8gWwRRCnKnFzu/wYoVYCI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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