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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f971207b2de3ea4f907c6a48ec9e05247b99c7d0870050206b8fbb7770f740bb' 
  AND token = 'GpWfGQeNVkRnZHk5LHbec3krE3faCW9YQcVMtPDmB68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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