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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bbb9cc477b1c109420b2f6158e7305575c61b8fae5805b9532b0092baa683d9' 
  AND token = 'm6gtNsRkCpHO6jQUXyZ/VeLfe/b5Epi+LBWMhhpWc4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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