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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48346374a866dba40e9ec20e8e0aeb5ea71937f7733f1cdd6e8c3cbd445b4337' 
  AND token = 'BmC2m8tbJFJS8OqlbyFfL1DsGSA5ClVTJXhWJxldZC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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