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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93262d03152c96230e20b64a650721385f5a742cf9ea12271a9de540f30a7b09' 
  AND token = 'KMqL3IGwM12qF9fFeNKTD46+KMkCVKsrlFtfzYY1xpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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