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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9285cae02104560b848f8d9a8d168f74bf835ec0bf914cf726e4790b38ef135' 
  AND token = 'kMuhmATImW23uwhOw16y0OiTNY+Qkk30QEQoBRa9kVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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