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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '387890b9916b7fc15058e8f54b58af1fafc764b1153151d6cb5a05b66628b160' 
  AND token = '6YngY9V5VOBLD0dctlyATHt320NJCL4BHqv0yIvaeKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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