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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be423f36613973b6af27786489a43656f26ac8d70b958cb8653975e7a8fc7bd9' 
  AND token = 'BlFT2WfNCUuo8rEikEKLFS7HfFt8L2E+GGPab3pL04c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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