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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e4d240c9a179128902b7b4beade85946c244042da8bd1679e87fa10f27bc594' 
  AND token = 'Fotg5d5TApRl2u5OxNPsG3cvJIRpYQBH7N0wIGgUolw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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