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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa2671a97508f43436befc8ab764632727df6674db10e62d9b5f7f85449c827' 
  AND token = 'xF9ECmB5rQ89yvgRvtAP7a/Sh1W+K/r+10Yye6fYwQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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