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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5caeb275a7bd571a4bb23c27ffdf869f017f10a8141c478d553f07224a0742e' 
  AND token = 'c7Vd1smZ2kZXV4kefBe4dpz0ncSNx0zhLCi6FrJYaSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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