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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddd06f516e0229a77062636b8d928d0d93a9e5075b0b0b445edb75a2faf4ea1e' 
  AND token = '9WMjIYKzMAe8uepOH+LCAxs+8no84XAO86N9OFBvTeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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