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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7839a2979b027b79a0a3e6cf0ba77872f15853201a1d3eb50a944a3039fa3b0e' 
  AND token = 'EGN4DyM8yAyUl7i7EFbrkBsACLH3+f2W64g2bkTjKEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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