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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '885083046a22232b2a6f99deef89b6c6e090c0565e52edb249ce0b6689e65d4d' 
  AND token = 'x2F9M3jdRDW3N++x30w0Z8nhCnF7y1X/Om8uXR1gfKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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