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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85cf62c22c67a66edd42dee950c28f9e1dd18839a3bed9724a197829857f4dd8' 
  AND token = '4k0j68PyU4NaC3Y2Ia1XVqUOOq4R2z/fMavKRyLfhdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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