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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb5271dba1312d57e613114bb07f7b1036b55fea1a7c56e58464c2cf1b3d987' 
  AND token = 'e/wmo0bOW6nGnkHkWKowwmMBFAI5ZdYzB3kgSDELCVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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