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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2b3803d908f0b9214298efa70e9a8231338080eedee196551ea0a021e224cd2' 
  AND token = 'cmp1/jkhUdsoBigzfTpXLA8+UcvfQwUCFD0vF6jup+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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