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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0efe9d00166ab3e3b9854cdbc6b1c68b45b5f886430d1461ac3f650d2e0bd8b0' 
  AND token = 'aslcHZswB4XlWz8zhNsX+JdqEqm4JGe4Ik4Sf82w2s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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