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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40beda72dffe14e3fe5b89bb7d5ef8c3887ecac0b5e175ddc2b1f6d95a2370c3' 
  AND token = 'p1iUNKfmHKk1u08u+P29mo1eamgup6xjQN2E+4LdKRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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