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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9756e7a52074474523604a47719689b244c97577dd73b2c094e4224ae0a02df6' 
  AND token = 'rr2XGCAU9/3GvTR4GaTuSe0X46+Sjme30v5g2LYJGZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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