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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24e26f6265ae437649f13b65641c28f15eb44ff80a84529694096862d0beb6d3' 
  AND token = 'r3o5AtaDEa+WyYHhTSi2WiXm+iYQ41zkdHiQb9LOZ78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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