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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a48b06253e44d97b416945f197dba9fb789765dcb1a8b2648213a2b68fb8743' 
  AND token = 'b9JUCrhuC0dFE6SRHyTgqTSM3Lrd2mxh1wL/hHjgqxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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