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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d20648331f313bc70f5214b8c93bbc03edce63119ebf7794933b4e2c2fce63' 
  AND token = 'MkYea63NAQ4X3pfupZAOmYfJO/KrCs/EOxMBHugIZ7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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