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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7860deca1add55e44be0560b2180e6fb012269fae4271fcc8e1d5e220bad22cb' 
  AND token = 'mkJjMkuUsFn7Fex01nbK7x2ANOP1OJSwA4gNZLGUgPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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