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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1909ee568de725e0b211c1ab45bee65446a625aede9828eed804a2059b1826e' 
  AND token = 'FpylTzI1zocCtyKaDuWptxmbgZ30uoYJx+Rlp8mJVzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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