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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63de7c1ad7812a0b3bb0d3d3246a09e79cbbc9d1dcc248f85daa673b5921df7a' 
  AND token = '+ScQ49ZGqRfnKlfo0wmvTqnHa27NTg9AbkcXLiaxG/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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