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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08082a3220f4fff31264c03ac59667ba93baa21f8fa528299e3a0d4f0fba304a' 
  AND token = '26v6PnoGj2HZKeUrLp2HQE2DQj2OIm3cgn8fiwgnlP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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