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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e516bbe2cafc5ed42a9408770ae2b2b649b8512b127667f0e8de4eb73423bb' 
  AND token = 'C+LvHDvFoiNMocTMeGKb8gsp0VO4Uzlt9nsAeU10+vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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