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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70adcb62a831c6f5d2882a3e133b1fb7a71a80a0fcfca8668c0021e161aedcc9' 
  AND token = '99ouLEcbvqwSD6OM/sRkX4uM3F5qjAwF+8bZ3eBjx4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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