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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c47ac00bf9ddf292f2bc84e148887145d4fe58cb61ec28f5a764c94050328e74' 
  AND token = '4yIozQJnud9giyuRI3yq9l8SL6/m/BpRwNPoRPqMcnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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