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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df2ecc93fe55a86d40eccd6b7d127b137739142250987659d5670743a159971e' 
  AND token = 'Dtz74SAV6H7fdTWeGM1ifSYx/nw6CBja4wgR+3Ra7ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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