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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a110ca9865104ae84778b18d2d780333cda704edceab87ea81ff7fa4fe47249' 
  AND token = 'j1nTusOAEdtIK/0ISiJDotYq20gNfl7aDukhQLNWVRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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