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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c574d2826e0f0bf4c0048aa2fb12f5e860b2bab9a12eafe16159b969f35a3a7e' 
  AND token = '7thD0YCEtlPU4WWYKB4P1r83DA4gqcANsWGYxyoqEFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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