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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941cd6c3e2ad34c4ff43310b795556d1fd8564783b7d9fdf5a10605395c74a2d' 
  AND token = 'fksR6hciKKiJaukQGrOYvg5PW+4iYWdbM+rZamDm21s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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