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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b3021faf99927168de340c6b072e38a09431fc6234458922fb83a916f86b9ce' 
  AND token = 'AILE2ryQlaDq4I0VvbQWhcseGZCQ//N/AptMK2bL3Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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