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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a68aa60d727f2d391c27e116791f8e85cd6b23db107a1b7981857f6616fed61' 
  AND token = '50xAEQp+Oi9JCRPfN3tA40srwOslLj26c2KaYMqE2Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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