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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c07a8d2a65ed507081c2e3ec5ac4c01c6d30d7144ce08f2e6e65fb596eb2b95' 
  AND token = '77QEeQJxGjPq8G33I1BRlPAG22KkMt/Wu3P4c3hM8JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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