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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '784833efe65007cab7a2fab6b22f4ed730556657cc60595c94b391a320ad4bb4' 
  AND token = 'dwa2aHBxbmh7lG4ytJATO1DcBU33bJnMCf+jbhUe0W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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