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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a788c9900b60c2e0967f66fa4b1219a60cbf4ad239644d672f89665e5e0a30' 
  AND token = 'ziVIrpRNkpVhZPL1kXZ2q965d3SfARpt7VkelW3geV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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