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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c44156bf5372730419f7a694d6b9d74fc88a4e2ff744e845c4350ba71853c65' 
  AND token = '8s5lg1wRVdad2sCQmMcUr/mohxwbllM5MoZMtm2yUXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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